Brad
The simple answer is no. Laser printers did not exist then so toner transfer was not possible. Silk screen materials were available and you could do a screen if you had access to a college art department.
Again you could cheat by doing a colour laser printout thermal transfer. You need some means of aligning the image to the board.
Malcolm
I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
Ha-ktovet al ha-kir
--------------------------------------------
On Wed, 9/30/15, 'Brad' unclefalter@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
Subject: RE: [Homebrew_PCBs] G-10 questions
To: Homebrew_PCBs@yahoogroups.com
Date: Wednesday, September 30, 2015, 5:51 AM
Thanks muchly Malcolm. That
makes things a lot clearer. Question – did you do any
silkscreening back then for parts placement? I notice in
the plans printed by Radio Electronics, they had the
printouts for the copper side, but also silkscreening for
the non-copper side to aid in parts placement. I’m
wondering how a home hobbyist at the time might have pulled
that off, or if they did. From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, September 29, 2015 4:15
PM
To:
Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] G-10
questions Back in those days I used two
methods:
Copper clad FR4 was available, but
a lot of SRBP was used as it was much cheaper.
The first method was to paint, by hand, using
mothers thinned nail varnish onto a carbon paper print
traced from the layout printout.
There was a
great negative photo resist, KPCR, made by Kodak, sadly no
longer available that you exposed to ultra violet light
through a negative transparency of the of the layout.
Then developed in a solvent based solution that
coloured your fingers red for at least a week if you got it
on them.
So you would not
be cheating if you used modern pre-sensitized copper FR4
from companies such as Mega,
<http://www.megauk.com/pcb_laminates.php>
or a dry film:
<http://www.instructables.com/id/Fantastic-Double-Sided-PCBs-at-home-using-photores/>
or
<https://www.youtube.com/watch?v=cRCFGZxmob0>
Malcolm
I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The
writing is on the wall.
Ha-ktovet al
ha-kir
--------------------------------------------
On Tue, 9/29/15, 'Brad'
unclefalter@... [Homebrew_PCBs]
<Homebrew_PCBs@yahoogroups.com> wrote:
Subject: [Homebrew_PCBs] G-10
questions
To:
Homebrew_PCBs@yahoogroups.com
Date: Tuesday,
September 29, 2015, 11:51 PM
Hi guys,
I’ve been continuing to
research and
amass parts for my TV Typewriter replica build.
I have a blog of it here:
http://bradhodge.ca/blog%c2%a0
-- mostly working
on the case right now to inspire me to
push
forward, but I’ve succeeded in getting almost all of
the vintage 1973 or earlier chips I needed.
Now I’m down
to the PCBs again.
I guess I’m still
kind of
‘green’ on this sort of thing. Ideally, I’d
like to do my PCBs the way they would have in
1973. But I
still don’t understand how
that worked. Don Lancaster
said the boards
used were green G-10. I found this on
ebay:
http://www.ebay.com/itm/16-Green-G-10-FR4-Sheets-032-Thick-x-28-x-7-25-G10-Material-/141719358328?hash=item20ff21cb78
I guess what I’m having trouble
with is
understanding how a home PCB maker in 1973 would
have gone about getting copper onto these
boards and copying
the artwork from the
article. Is there any really good,
baby-steps reading out there? I just want to
understand
the original process and if it is
possible to replicate it
here in 2015. I
sort of understand the idea behind photo
lithography.. I’m just not understanding how
copper ends
up on board, etc. Much
appreciated! BRad
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#yiv0643880995
No virus found in this
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Checked by AVG - www.avg.com
Version: 2015.0.6086 / Virus Database:
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Internal
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